Definition of mountain bike noun from the Oxford Advanced Learner's Dictionary

 

mountain bike

 noun
noun
BrE BrE//ˈmaʊntən baɪk//
 
; NAmE NAmE//ˈmaʊntən baɪk//
 
Cycling, Hobbies
 
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a bicycle with a strong frame, wide tyres and many gears, designed for riding on rough ground See related entries: Cycling, Hobbies
See the Oxford Advanced American Dictionary entry: mountain bike